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Gallium Solar Neutrino Experiments: Absorption Cross sections, Neutrino spectra, and Predicted Event Rates
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Neutrino absorption cross sections for 71Ga are calculated for all solar neutrino sources with standard energy spectra, and for laboratory sources of 51Cr and 37Ar; the calculations include, where appropriate, the thermal energy of fusing solar ions and use improved nuclear and atomic data. The ratio, R, of measured (in GALLEX and SAGE) to calculated 51Cr capture rate is R = 0.95 +/- 0.07 (exp)} + ^{+0.04}_{-0.03} (theory). Cross sections are also calculated for specific neutrino energies chosen so that a spline fit determines accurately the event rates in a gallium detector even if new physics changes the energy spectrum of solar neutrinos. Theoretical uncertainties are estimated for cross sections at specific energies and for standard neutrino energy spectra. Standard energy spectra are presented for pp and CNO neutrino sources in the appendices. Neutrino fluxes predicted by standard solar models, corrected for diffusion, have been in the range 120 SNU to 141 SNU since 1968.
Forward citations
Cited by 6 Pith papers
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A possible solution to the gallium anomaly moving beyond the leptonic wave function factorization
A non-factorized amplitude treatment with a fitted sign-changing nuclear transition density reduces the predicted νe-71Ga capture rate by ~20%, absorbing the gallium anomaly without new physics.
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BEST-2 proposes a cobalt-58 neutrino source and a three-zone gallium target to measure sterile-neutrino oscillation parameters and test the energy dependence of the gallium anomaly.
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The Gallium Solar Neutrino Capture Cross Section Revisited
Updated 71Ga solar neutrino capture cross sections raise the 8B and hep rates by about 7% and 10% over Bahcall's 1997 values and cut the uncertainties by a factor of 2 to 3.
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Solar Model Independent Constraints on the Sterile Neutrino Interpretation of the Gallium Anomaly
A global analysis of solar and KamLAND neutrino data finds that the sterile-neutrino explanation of the gallium anomaly remains disfavored at about 3 sigma or higher under all reasonable modeling assumptions.
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Constraints on Fermionic Dark Matter Absorption from Radiochemical Solar-Neutrino Measurements
Reanalysis of solar neutrino capture rates yields 90% upper limits of 0.39-0.59 SNU on fermionic dark matter induced contributions, mapping to y bounds of 4.9-7.1 x 10^{-49} cm^2 at 1 MeV dark matter mass.
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The gallium anomaly revisited
Updated nuclear calculations lower the gallium anomaly significance to 2.3σ.
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